Post-FEC performance evaluation of coherent QPSK system with an enhanced pilot-aided CPE scheme |
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Authors: | Haiquan?Cheng Huizhong?Chen Email author" target="_blank">Yan?LiEmail author Chao?Lu Jian?Wu Jintong?Lin |
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Affiliation: | 1.State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing,China;2.Department of Electronic and Information Engineering,The Hong Kong Polytechnic University,Hung Hom,Hong Kong |
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Abstract: | In this paper, a simple and robust pilot-aided carrier phase estimation scheme with a modified phase unwrapping is proposed. The principle of the proposed phase unwrapping is shown with a step-by-step procedure. Further, we test the post-FEC BER performance for the pilot-aided carrier phase estimation scheme with the traditional and proposed phase unwrapping. For the proposed phase unwrapping, a cycle slip rate reduction of about 10 times is achieved than the case using the traditional phase unwrapping through simulations in the presence of Wiener phase noise. Finally, we present a 2.2 Eb/N0 gain and post-FEC error-free performance with only 0.78 % pilot overhead in a 32-Gbaud QPSK system using soft-decision forward error correction. |
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